Nicole Kidman (2001 vs. 2015)

Forehead: Botox seems to have smoothed Nicole's crow's-feet and the "11s between her brows," notes surgeon Dr. Mirwat Sami, who has not worked with the actress. "But her eyelids look heavy."

Skin: With her ginger hair and fair skin, Nicole wisely shuns the sun and its skin-ravaging rays. However, docs say laser resurfacing has likely helped her complexion look brighter and firmer now.

Cheeks: "Apparent fillers in her midface have provided fullness and a lift," says Dr. Sami. "They've also diminished deep lines between her nose and mouth."

Jaw: "The likely fillers around Nicole's mouth look very good," observes plastic surgeon Dr. Lyle Back, who does not call Nic a patient. He suspects the Aussie's tight jawline and smooth neck came courtesy of a mini-face-lift.

Kristin Chenoweth (2001 vs. 2015)

Forehead: Regular Botox shots for migraines have kept Kristin's forehead smooth and wrinkle-free. "She may also have had an ultrasound brow lift," says dermatologist Dr. Simon Ourian, who has not treated the actress.

Nose: "Her nose is narrower and has a somewhat bony tip, which is often an indication of a rhinoplasty," notes plastic surgeon Dr. Barry M. Weintraub, who has also not treated Kristin.

Cheeks: Dermal fillers such as Juvéderm Voluma have replaced facial volume loss due to aging, shares Dr. Ourian. "To make her eyes appear larger, I would reduce the filler below them."

Chin: "Kristin originally had a rather pointed chin," observes Dr. Weintraub. "But now her jawline is more squared-off and wider, indicative of a chin augmentation."

Iggy Azalea (2012 vs. 2015)

Forehead: "It looks like she's had Botox injections [up to $2,000 a year] around her eyebrows," notes Philadelphia plastic surgeon Dr. Lyle M. Back, who has never treated the star. He also suspects Iggy may have had a "brow lift" and her "eyes done."

Nose: "That's a major nose job!" pronounces Dr. Back, who has also not worked with Iggy. Houston's Dr. Mirwat Sami — who has also not worked with Iggy — agrees that Iggy's had "nose reconstruction surgery or cosmetic rhinoplasty." Price? $12,500.

Chin: In addition to plumping up her midface and upper lip, says Dr. Sami, "Iggy now has a more prominent chin, which could be from either an implant [$7,000] or fillers [$4,000]."

Bust: "Prior to implants, Iggy was reportedly a size 32B," notes Dr. Back. "She now appears to be a D- to DD-cup, which is more proportionate to her 5-foot-10 frame." Cost: $15,000.

Kim Zolciak-Biermann (2009 vs. 2015)

Forehead: "Kim has no wrinkles, period — she must use copious amounts of Botox regularly," says cosmetic laser surgeon, Dr. Dima, who has not worked with Kim. "But it's dropped her brows, making them look a little heavy."

Cheeks: Juvéderm injections have pumped up the volume in Kim's face, reports Dr. Dima, who says it's filled out her cheeks, under-eye hollows and smile lines.

Skin: "Her complexion is flawless, so it's very likely she's had treatments with a noninvasive device like the eMatrix, which stimulates collagen and firms skin while evening out tone," notes Dr. Dima.

Bust: "Having six children takes a toll, causing breasts to droop," says plastic surgeon, Dr Lyle Back, who has also not treated Kim. "Replacing her implants with larger ones that are still proportional with her frame, as Kim has, was the right move."

Jaime Pressly (1999 vs. 2015)

Forehead: Her smooth brows are hallmarks of Botox, says celebrity dermatologist Dr. David Bank, who has not worked with Jaime. NYC plastic surgeon Dr. Michelle Copeland, who has also not worked with the actress, thinks she may have had a forehead lift.

Eyes: "Injections have smoothed her crow's-feet and given her eyes a bright, natural look," observes Dr. Bank.

Skin: "Jaime's skin is glowing and has a satiny finish," notes Dr. Bank, who suspects she's had a resurfacing treatment.

Jaw: The actress "may have opted for a procedure like Thermage to keep jowls from forming," suggests Dr. Bank.